(1)  If an authorised officer reasonably believes that entry into premises is necessary for an authorised purpose, the authorised officer may enter the premises –

(a) in an emergency, at any time; and

(b) in any other case, at any reasonable time.

(2)  A function conferred by this Act that authorises entry into premises authorises entry –

(a) on foot, by vehicle, vessel or aircraft, or by any other reasonable means; and

(b) by drone or other pilotless vehicle or equipment under remote control.

(3)  Entry into any premises authorised under this Act may be effected –

(a) only with the use of reasonable force; and

(b) subject to subsection (4), with or without the authority of a warrant.

(4)  Despite subsection (3) , nothing in this section authorises entry into any part of residential premises, other than –

(a) with the consent of the occupier of the residential premises; or

(b) under the authority of a warrant; or

(c) in an emergency, if the Secretary has given notice to the occupier of the residential premises under section 174(4) , section 188(5) or section 197(4) before the authorised officer is to enter the residential premises.

(5)  For the purposes of subsection (4)(a) , an occupier of residential premises is taken to have consented to an authorised officer entering the residential premises in an emergency if –

(a) at least 48 hours before the authorised officer intends to enter the residential premises, the authorised officer has given written notice of that intention to the occupier; and

(b) the occupier does not respond to the authorised officer, in respect of that written notice, before the authorised officer intends to enter the residential premises as notified.